Numerical simulation of structural optimization of inverse-parallel flow horizontal air floats

doi:10.19965/j.cnki.iwt.2024-0565

Abstract

Abstract:

The reverse-parallel flow horizontal air floats have the advantages of high collision efficiency and adhesion contact between bubbles and flocs, and the stability of the combined flocs. The Euler multiphase flow model and realizable k-ε turbulence model were used for CFD numerical simulation to study the effects of structural and operating parameters on the internal flow state and flow field. The simulation results showed that the height of the baffle was 1 000 mm, and the distance to the contact area was 250 mm, the distance from the dissolved air inlet 1 to the left wall was 90 mm, the distance from the dissolved air inlet 2 to the left wall was 340 mm, the bubble diameter was 30 μm, and the reflux ratio was 10% the flow pattern and flow field distribution of the reverse and parallel flow horizontal air float were reasonable. Air float oil removal environment was excellent.

Key words: flocs, vortex, gas phase distribution, contact area, separation zone

摘要：

逆向-并向流卧式气浮器具有气泡与絮体碰撞和黏附接触效率高、结合成的泡絮体稳定等优点，采用欧拉多相流模型和realizable k-ε湍流模型进行流体动力学（CFD）数值模拟，研究了结构参数和运行参数对其内部流态和流场的影响。模拟结果表明，挡流板高度为1 000 mm，并向接触区的距离为250 mm，溶气口1到左壁面距离为90 mm、溶气口2到左壁面距离为340 mm，气泡直径为30 μm，回流比为10%时，逆向-并向流卧式气浮器的流态和流场分布合理，气浮除油环境极佳。

关键词: 泡絮体, 涡旋, 气相分布, 接触区, 分离区

CLC Number:

X703.3

Xingzhen LI, Ningxia YIN, Guangwei CHENG, Ying WANG. Numerical simulation of structural optimization of inverse-parallel flow horizontal air floats[J]. Industrial Water Treatment, 2025, 45(4): 106-114.

李兴振, 尹凝霞, 程光玮, 王英. 逆向-并向流卧式气浮器结构优化的数值模拟[J]. 工业水处理, 2025, 45(4): 106-114.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2024-0565

https://www.iwt.cn/EN/Y2025/V45/I4/106

Figures/Tables 10

Fig.1 Schematic diagram of the inverse-parallel flow horizontal air float

Fig.2 Geometric model and grid division of the inverse-parallel flow horizontal air float

Fig.3 Grid independence verification

Fig.4 Volume fraction distribution of gas phase in the reverse-parallel flow horizontal air floats at different baffle heights

Fig.5 Turbulent kinetic energy of the inverse-parallel horizontal air float at different baffle heights

Fig.6 Turbulent dynamic viscosity cloud map of a horizontal air float with reverse and parallel flow at different distances to the contact zone

Fig.7 Water phase velocity cloud/flow diagram of the reverse-parallel horizontal air float at different outlet positions

Fig.8 Effects of different bubble diameters on the gas content in the water of the reverse-parallel flow horizontal air float

Fig.9 Gas phase volume fraction distribution of reverse-parallel horizontal air floats at different reflux ratios

Fig.10 Cloud/flow diagram of water phase velocity of a reverse-parallel horizontal air float at different reflux ratios

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